Tap WaterIndex

← California

Tap water quality report

Joint Regional Water Supply

EPA monitoring tested this supplier for 12 contaminants and detected 10. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

12
contaminants tested
10
detected
3,947
people served
0
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
SWP
Ownership
Local government
Counties served
Orange

Compliance record

No violations on file. The EPA has no formal drinking-water violations recorded for this supplier.

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Bromodichloromethane
26.5 µg/L
No EPA limit set
 165/165 SYR4 2012–2019
Chloroform
40.7 µg/L
No EPA limit set
 165/165 SYR4 2012–2019
Dibromochloromethane
29 µg/L
No EPA limit set
 165/165 SYR4 2012–2019
TTHM
80.5 µg/L 101%
of the EPA limit, in the worst sample — 80 µg/L
 165/165 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
34.7 µg/L 58%
of the EPA limit 60 µg/L
 165/165 SYR4 2012–2019
Dichloroacetic Acid
18.3 µg/L
No EPA limit set
 163/165 SYR4 2012–2019
Bromoform
10.2 µg/L
No EPA limit set
 161/165 SYR4 2012–2019
Trichloroacetic Acid
15.5 µg/L
No EPA limit set
 161/165 SYR4 2012–2019
Dibromoacetic Acid
8.63 µg/L
No EPA limit set
 154/165 SYR4 2012–2019
Lead
0.0059 mg/L 39%
of the EPA limit 0.0150 mg/L
 4/4 LCR 2024
2 contaminants tested, none detected
Monobromoacetic AcidMonochloroacetic Acid

Utility contact

Contact
SERNA, MARC
Phone
949-342-2179
Email
mserna@scwd.org

Frequently asked questions about Joint Regional Water Supply

Is Joint Regional Water Supply tap water safe to drink?

EPA monitoring detected 10 contaminants in Joint Regional Water Supply's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Joint Regional Water Supply's water?

EPA monitoring detected Bromodichloromethane, Chloroform, Dibromochloromethane, TTHM, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.

How many people does Joint Regional Water Supply serve?

Joint Regional Water Supply reports serving 3,947 people in California, per its EPA record.

Has Joint Regional Water Supply had any water quality violations?

The EPA has no formal drinking-water violations on file for Joint Regional Water Supply.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.